Steam generator



March 5, 1935. G. w. BACH STEAM GENERATOR v Filed May 2, y19:62

- BY ff?, i@

n ATTORNEYS.

boilers.

Patented Mar. 5, 1,935

UNITED STATESl STEAM GENERATOR George W. Bach, rie, Pa., assignor toUnion Iron Works, Erie, Pa., a corporation of Pennsylvania ApplicationMay 2, 1932, Serial No. 608,717

3 Claims. c (Cl. 122-478) Steam generators are preferably supplied withsuperheaters. The present invention is designed to improve and simplifythe arrangement of superheaters in connection with steam Featuresk anddetails of .the invention will appear from the specification and claims.

Preferred embodiments of the invention are illustrated in theaccompanying drawing as folloWs:-

Fig. 1 shows a central vertical section throug a boiler on the line 1-1in Fig. 2. Y

Fig. 2 a section on the line 2-2 in Fig. 1, a part of the drum beingbroken away to better show the construction.

1 marks the furnace in which the boiler is mounted, 2 a front drum, 31arear drum, 4 a bottom drum, 5 and 6 steaming banks'of tubes between thelower and front drum, 7 down-take tubes between the rear drum'and lowerdrum, 8 upper water tubes connecting the drums, and 9 upper steam tubesconnectingthe drums. A bae v10 is provided carrying the gases from thefurnace to a pass upwardly andv downwardly between the upper drums.

The steam tubes 9 discharge into'a channel 11 arranged withinthe reardrum. This channel has open ends 12 communicating with the y rear drum.Superheater tubes 13 lead from the channel 11 across the upper part ofthe furnace toward the front drum and has a return loop 14 leading tothe rear drum. A chamber 15 re.

ceives the steam from the return loop i4 and a steam discharge pipe 16leads from the chamber. The chamber 15 has closed ends 17 so that thereis no mixture betweenthe superheated steam and the saturated steam. Y

In order that theV generator may be self-draining the chamber 15 has aslight drainage opening 18 permitting the drainage of water from thechamber l5 to the rear drum. This opening, however, is not suicient toinvolve any material movement of steam from the rear drum to thechambers In this it will be seen that a very simple and convenientstructure is provided. 'I'he channel and chamber Walls may be formed ofVery light metal as the pressures are practically balanced within therear drum.

What I claim as new is:-

1. In a steam generator, the combination of a front drum; a rear drum; adownwardlyV extending circulating system connecting said drums andcomprising steaming and downltake tubes, the major portion of thesteaming tubes leading to the front drum; upper water tubes l' 5connecting the front and rear drums; upper Asteam tubes connecting thefront and realr drums; a connecting channel at the rear drum into whichthe steam tubes discharge; superheater tubes leading from the channeland ex- 10 tending toward the front drum and returning to the rear drum;a chamber in the rear drum to which the superheater tubes discharge; and

a steam discharge from the chamber.

2. In a steam generator, the combination of l5 a front drum; a reardrum; a downwardly extending circulating system connecting said drumsand comprising steamingv and down-take tubes, the major portion of thesteaming tubes leading to the front drum; upper water tubes 20connecting the front and rear drums; upper steam rtubes connecting thefront and rear drumsya connecting channel at the rear drum into whichthe steam tubes discharge, said channel opening to the rear drum;superheater tubes 25 leading from the channel and extending toward lthefront drum and returning to the rear drum;

a chamber in the rear drum to which the superheater tubes discharge; andasteam discharge from the chamber. 30v

Vinto which the steam tubes discharge; superheater tubes leading fromthe channel and extending toward theY front drum and returning to therear drum; achamber in the rear drum to which the superheater tubesdischarge; and a l45 steam discharge from the chamber, said channelextending through the chamber VVand connecting with the rear drum.

`GiEORGE W. BACH. 50

